Z86L78 Datasheet, PDF (55/59 Pages) Zilog, Inc. – IR/Low-Voltage Microcontroller

Zilog
Z8 STANDARD CONTROL REGISTER DIAGRAMS
Z86L78
IR/Low-Voltage Microcontroller
R247 P3M
D7 D6 D5 D4 D3 D2 D1 D0
** Effects P34 and P35 as well.
* Default setting after Reset.
0 Port 2 Open Drain*
1 Port 2 Push-pull
0 Digital*
1 Analog
Reserved (Must be 0.)
Reserved (Must be 0.)
0 P31 = Input (T_IN)*
P36 = Output (T_OUT)
1 P31 = /DAV2/RDY2
P36 = RDY2//DAV2
Reserved (Must be 0.)
Figure 47. Port 3 Mode Register
(F7H: Write Only)
R249 IPR
1
D7 D6 D5 D4 D3 D2 D1 D0
*Group A only has IRQ3 within it
Interrupt Group Priority
000 Reserved
001 C > A > B
010 A > B > C
011 A > C > B
100 B > C > A
101 C > B > A
110 B > A > C
111 Reserved
IRQ1, IRQ4 Priority (Group C)
0 IRQ1 > IRQ4
1 IRQ4 > IRQ1
IRQ0, IRQ2 Priority (Group B)
0 IRQ2 > IRQ0
1 IRQ0 > IRQ2
Reserved (Must be 0)
Reserved (Must be 0)
Figure 49. Interrupt Priority Registers
((0) F9H: Write Only)
R248 P01M
D7 D6 D5 D4 D3 D2 D1 D0
R250 IRQ
D7 D6 D5 D4 D3 D2 D1 D0
P00-P03 Mode
00 Output
01 Input*
1X A11-A8
Reserved (Must be 0.)
Reserved (Must be 0.)
Reserved (Must be 0.)
P07-P04 Mode
00 Output
01 Input*
Notes:
1X A15-A12
Only P00 and P07 are available on Z86L71.
* Default Setting After Reset.
Figure 48. Port 0 and 1 Mode Register
(F8H: Write Only)
Default Setting After Reset = 0000 0000
IRQ0 = P32 Input
IRQ1 = P33 Input
IRQ2 = P31 Input
IRQ3 = T16_OUT
IRQ4 = T8_OUT
Reserved (Must be 0)
Inter Edge
P31 ↓ P32 ↓ = 00
P31 ↓ P32 ↑ = 01
P31 ↑ P32 ↓ = 10
P31 ↑↓ P32 ↑↓ = 11
Figure 50. Interrupt Request Register
((0) FAH: Read/Write)
DS97LVO0701
2-55